In by Mark Goodman

A white powder that forms on the surface of concrete/masonry walls as a result of water evaporation.

Merriam-Webster Online Dictionary
efflorescence (noun)
a) the action or process of developing and unfolding as if coming into flower - blossoming periods of … intellectual and artistic efflorescence Julian Huxley
b) an instance of such development
c) fullness of manifestation - culmination
the period or state of flowering
the process or product of chemically - efflorescing
efflorescence (Wikipedia)
Secondary efflorescence on the dam of the Robert Moses Niagara Power Plant.

In chemistry, efflorescence (which means "to flower out" in French) is the migration of a salt to the surface of a porous material, where it forms a coating. The essential process involves the dissolving of an internally held salt in water, or occasionally in another solvent. The water, with the salt now held in solution, migrates to the surface, then evaporates, leaving a coating of the salt.

In what has been described as "primary efflorescence," the water is the invader and the salt was already present internally. Some people describe a reverse process, where the salt is originally present externally and is then carried inside in solution, as "secondary efflorescence." However, others would give this latter phenomenon another name entirely.

Efflorescences can occur in natural and built environments. On porous construction materials it may present a cosmetic outer problem only (primary efflorescence causing staining), but can sometimes indicate internal structural weakness (migration/degradation of component materials).

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